<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
    <!-- 提示区域 -->
    <el-alert
    title="添加商品信息"
    type="info"
    show-icon :closable="false">
    </el-alert>
        <!-- 步骤条区域 -->
        <!-- 通过activeIndex属性联动2组数据 -->
        <!-- 纯数字字符串-0转化为纯数字-->
        <el-steps :space="200" 
        :active="activeIndex-0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
        </el-steps>
          
          <!-- tab栏区域 -->
          <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px"
          label-position="top">
              <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClicked">
              <el-tab-pane label="基本信息" name="0">
                <el-form-item label="商品名称" prop="goods_name">
                  <el-input v-model="addForm.goods_name" placeholder=""></el-input>
                </el-form-item>
                <el-form-item label="商品价格" prop="goods_price">
                  <el-input v-model="addForm.goods_price" placeholder=""
                  type="number"></el-input>
                </el-form-item>
                <el-form-item label="商品重量" prop="goods_weight">
                  <el-input v-model="addForm.goods_weight" placeholder=""
                  type="number"></el-input>
                </el-form-item>
                <el-form-item label="商品数量" prop="goods_number">
                  <el-input v-model="addForm.goods_number" placeholder=""
                  type="number"></el-input>
                </el-form-item>
                <el-form-item label="商品分类" prop="goods_cat">
                   <el-cascader 
                  :options="catelist" :props="cateProps"
                  v-model="addForm.goods_cat"
                  @change="handleChange">
                </el-cascader>
                </el-form-item>
              </el-tab-pane>
              <el-tab-pane label="商品参数" name="1">
                <!-- 渲染表单的Item项 -->
                <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                  <!-- 复选框组 -->
                  <el-checkbox-group v-model="item.attr_vals">
                  <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key="i" border>
                  </el-checkbox>
                </el-checkbox-group>
                </el-form-item>
              </el-tab-pane>
              <el-tab-pane label="商品属性" name="2">
                <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                  <el-input v-model="item.attr_vals"></el-input>
                </el-form-item>
              </el-tab-pane>
              <el-tab-pane label="商品图片" name="3">
                <!-- action表示图片要上传到的后台API地址 -->
                <el-upload
                  :action="uploadURL"
                  :on-preview="handlePreview"
                  :on-remove="handleRemove"
                  list-type="picture" :headers="headerObj" :on-success="handleSuccess">
                  <el-button size="small" type="primary">点击上传</el-button>
                </el-upload>
              </el-tab-pane>
              <el-tab-pane label="商品内容" name="4">
                <!-- 富文本编辑器组件 -->
                 <quill-editor v-model="addForm.goods_introduce">
                 </quill-editor>
                 <!-- 添加商品的按钮 -->
                 <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
              </el-tab-pane>
              </el-tabs>
          </el-form>
    </el-card>
    <!-- 图片预览 -->
    <el-dialog
  title="图片预览"
  :visible.sync="previewVisible"
  width="50%">
  <img :src="previewPath" class="previewImg">
</el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'


export default {
  data() {
    return {
      activeIndex:'0',
      //添加商品的表单数据对象
      addForm:{
        goods_name:'',
        goods_price:0,
        goods_weight:0,
        goods_number:0,
        //商品所属的分类数组
        goods_cat:[],
        //图片的数组
        pics:[],
        //商品的详情描述
        goods_introduce:'',
        attrs:[]
      },
      addFormRules:{
        goods_name:[
          {required:true,message:'请输入商品名称',trigger:'blur'}
        ],
        goods_price:[
          {required:true,message:'请输入商品价格',trigger:'blur'}
        ],        
        goods_weight:[
          {required:true,message:'请输入商品重量',trigger:'blur'}
        ],
        goods_number:[
          {required:true,message:'请输入商品数量',trigger:'blur'}
        ],
        goods_cat:[
          {required:true,message:'请选择商品分类',trigger:'blur'}
        ]},
        //商品分类列表
        catelist:[],
        cateProps:{
          expandTrigger:'hover',
          label:'cat_name',
          value:'cat_id',
          children:'children'
      },
      //动态参数列表数据
      manyTableData:[],
      //静态属性列表数据
      onlyTableData:[],
      //上传图片的URL地址
      uploadURL:'http://127.0.0.1:8888/api/private/v1/upload',
      //图片上传组件的headers请求头对象
      headerObj:{
        Authorization:
        window.sessionStorage.getItem(`token`)
      },
      previewPath:'',
      previewVisible:false
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    //获取所有商品分类数据
    async getCateList(){
     const{data:res} = await this.$http.get(`categories`)

     if(res.meta.status !== 200){
       return this.$message.error(`获取商品分类数据失败! `)
     }
     this.catelist = res.data
     //console.log(this.catelist)
    },
    //级联选择器
    handleChange(){
      //console.log(this.addForm.goods_cat)
      if(this.addForm.goods_cat.length!==3){
       this.addForm.goods_cat=[]
      }
    },
    beforeTabLeave(activeName,oldActiveName){
      //console.log(`即将离开的标签页是${oldActiveName}`);
      //console.log(`即将进入的标签页是${activeName}`);
      if(oldActiveName==="0"&&this.addForm.goods_cat.length!==3){
      this.$message.error(`请先选择商品分类! `)
      return false
      } 
    },
   async tabClicked(){
      //console.log(this.activeIndex)
      //证明访问的是动态参数面板
      if(this.activeIndex==='1'){
      const{data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,
      {
          params:{sel:'many'}
        }
        )
        if(res.meta.status!==200){
          return this.$message.error(`获取动态参数列表失败! `)
        }
        console.log(res.data);
        res.data.forEach(item =>{
          item.attr_vals = 
          item.attr_vals.length === 0 ? []
          : item.attr_vals.split(' ')
        })
        this.manyTableData = res.data
      }else if(this.activeIndex==='2'){     
       const{data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
          params:{sel:'only'}
        })

        if(res.meta.status!==200){
          return this.$message.error(`获取静态属性失败! `)
        }

        //console.log(res.data)
        this.onlyTableData = res.data
      }
    },
    //处理图片预览效果
    handlePreview(file){
      //console.log(file)
      this.previewPath =
     file.response.data.url 
     this.previewVisible=true
    },
    //处理移除图片的操作
    handleRemove(file){
      //console.log(file)
      //1.获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      //2.从pics数组中,找到这个图片对应的索引值
      const i =
      this.addForm.pics.findIndex(x =>
      x.pic === filePath)
      //3.调用数组的splice方法,把图片对象,从pics数组中移除
      this.addForm.pics.splice(i,1)
      console.log(this.addForm)
    },
    //监听图片上传成功的事件
    handleSuccess(response){
      //console.log(response)
      //1.拼接得到1个图片信息对象
      const picInfo = {pic:response.data.tmp_path}
      //2.将图片信息对象,push到pics数组中
      this.addForm.pics.push(picInfo)
      console.log(this.addForm)
    },
    //添加商品
    add(){
      //console.log(this.addForm);
      this.$refs.addFormRef.validate(async valid=>{
        if(!valid){
          return this.$message.error(`请填写必要的表单项! `)
        }
        //执行添加的业务逻辑
        //利用lodash对this.addForm进行深拷贝
        //objnew = _.cloneDeep(obj)
        const form = _.cloneDeep(this.addForm)
        //将数组转换为','分割的字符串
        form.goods_cat = form.goods_cat.join(',')
        //处理动态参数
        this.manyTableData.forEach(item=>{
          const newInfo = {attr_id:item.attr_id,attr_value:item.attr_vals.join(' ')}
          this.addForm.attrs.push(newInfo)
        })
        //处理静态属性
        this.onlyTableData.forEach(item=>{
          const newInfo = {attr_id:item.attr_id,attr_value:item.attr_vals}
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        //console.log(form)

        //发起请求添加商品
       //商品的名称,必须是唯一的
      const{data:res} =  await this.$http.post(`goods`,form)

      if(res.meta.status!==201){
        return this.$message.error(`添加商品失败! `)
      }
      
       this.$message.success(`添加商品成功! `)
       this.$router.push(`/goods`)
      })
    }
  },
  computed:{
    cateId(){
      if(this.addForm.goods_cat.length===3){
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style lang="less" scoped>
.el-checkbox{
  margin: 0 10px 0 0 !important;
}
.previewImg{
  width: 100%;
}
.btnAdd{
  margin-top: 15px;
}
</style>